Note: This bug is displayed in read-only format because
the product is no longer active in Red Hat Bugzilla.
RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Description:
guest can't start nomarly after change the max memmory with the command setmaxmem.
Like do this use setmaxmem set the guest's memory
1G --> 4G start normally
4G --> 400MB start normally
400MB --> 4G guest kernel panic
How reproduce:
100%
Version:
libvirt-0.9.8-1.el6.x86_64
qemu-kvm-0.12.1.2-2.209.el6.x86_64
kernel-2.6.32-220.el6.x86_64
---------------------------------------------------------------------------------
Steps:
1. Have a healthy shut down guest.
[root@timesu tmp]# virsh dominfo rhel6
Id: -
Name: rhel6
UUID: 075d6f58-cb21-2cbc-796c-60b389457912
OS Type: hvm
State: shut off
CPU(s): 2
Max memory: 1048576 kB
Used memory: 1048576 kB
Persistent: yes
Autostart: disable
Managed save: no
Security model: selinux
Security DOI: 0
[root@timesu ~]# free
total used free shared buffers cached
Mem: 7949448 1297032 6652416 0 182496 522712
-/+ buffers/cache: 591824 7357624
Swap: 0 0 0
Note:My guest have 1G memory with both Max and Used.It's important for the step next.
--------------------------------------------------------------------------------------
2.Set the guest's Max memory to 4G and make sure it can start normally.
[root@timesu tmp]# virsh setmaxmem rhel6 4194300
[root@timesu tmp]# virsh start rhel6
Domain rhel6 started
[root@timesu tmp]# virsh dominfo rhel6
Id: 53
Name: rhel6
UUID: 075d6f58-cb21-2cbc-796c-60b389457912
OS Type: hvm
State: running
CPU(s): 2
CPU time: 12.7s
Max memory: 4194300 kB
Used memory: 1048576 kB
Persistent: yes
Autostart: disable
Managed save: no
Security model: selinux
Security DOI: 0
Security label: system_u:system_r:svirt_t:s0:c746,c927 (enforcing)
[root@timesu ~]# free
total used free shared buffers cached
Mem: 7949448 1986112 5963336 0 182496 522388
-/+ buffers/cache: 1281228 6668220
Swap: 0 0 0
[root@timesu tmp]# virsh destroy rhel6
Domain rhel6 destroyed
----------------------------------------------------------------------------------
3. set the guest's Max memory to 400M and make sure it can start normally.
And make sure set 400M not 800M or bigger too.
I will explain the reason in Additional info.
[root@timesu tmp]# virsh setmaxmem rhel6 419430
[root@timesu tmp]# virsh start rhel6
Domain rhel6 started
[root@timesu tmp]# virsh dominfo rhel6
Id: 54
Name: rhel6
UUID: 075d6f58-cb21-2cbc-796c-60b389457912
OS Type: hvm
State: running
CPU(s): 2
CPU time: 19.7s
Max memory: 419430 kB
Used memory: 419432 kB
Persistent: yes
Autostart: disable
Managed save: no
Security model: selinux
Security DOI: 0
Security label: system_u:system_r:svirt_t:s0:c471,c643 (enforcing)
[root@timesu ~]# free
total used free shared buffers cached
Mem: 7949448 1362224 6587224 0 182496 523288
-/+ buffers/cache: 656440 7293008
Swap: 0 0 0
[root@timesu tmp]# virsh destroy rhel6
Domain rhel6 destroyed
Note:Here is a question.
when the guest fully started , i use dominfo to get the information above.
the Used is bigger than the Max.But the guest works fine.
------------------------------------------------------------------------------------
4.set the guest's Max memory to 4G and I hope it can start normally - -.
[root@timesu tmp]# virsh setmaxmem rhel6 4194300
[root@timesu tmp]# virsh start rhel6
Domain rhel6 started
[root@timesu tmp]# virsh dominfo rhel6
Id: 55
Name: rhel6
UUID: 075d6f58-cb21-2cbc-796c-60b389457912
OS Type: hvm
State: running
CPU(s): 2
CPU time: 42.1s
Max memory: 4194300 kB
Used memory: 465916 kB
Persistent: yes
Autostart: disable
Managed save: no
Security model: selinux
Security DOI: 0
Security label: system_u:system_r:svirt_t:s0:c279,c620 (enforcing)
[root@timesu ~]# free
total used free shared buffers cached
Mem: 7949448 2034736 5914712 0 182496 522888
-/+ buffers/cache: 1329352 6620096
Swap: 0 0 0
================================================================================
At this time , the guest was hung.There was NO error log in libvirt.log and the rhel6.log.
================================================================================
[root@timesu tmp]# virsh destroy rhel6
Domain rhel6 destroyed
Note:I upload a snapshot of my guest when it hung in attachment.
--------------------------------------------------------------------------------------
PS: For restore the guest , you can do this.
[root@timesu tmp]# virsh setmaxmem rhel6 1024100
[root@timesu tmp]# virsh start rhel6
Domain rhel6 started
[root@timesu tmp]# virsh dominfo rhel6
Id: 56
Name: rhel6
UUID: 075d6f58-cb21-2cbc-796c-60b389457912
OS Type: hvm
State: running
CPU(s): 2
CPU time: 9.8s
Max memory: 1024100 kB
Used memory: 419432 kB
Persistent: yes
Autostart: disable
Managed save: no
Security model: selinux
Security DOI: 0
Security label: system_u:system_r:svirt_t:s0:c626,c822 (enforcing)
Now it becomes healthy again.If you want to hung it again , just repeat the step 2-4.
--------------------------------------------------------------------------------
Actual result
the guest can't start normally.
--------------------------------------------------------------------------------
Expect result
the guest can start normally.
--------------------------------------------------------------------------------
Additional info:
For step 3:If set max's memory to 800M , the guest can work well.
For reproduce the issue , you need change the max's by a wide margin.
I don't know the accurate value, but 400M to 4G is enough to reproduce the problem.
--------------------------------------------------------------------------------
Here is the guest's qemu log when it hung:
LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin QEMU_AUDIO_DRV=none /usr/libexec/qemu-kvm -S -M rhel6.2.0 -enable-kvm -m 4096 -smp 2,sockets=2,cores=1,threads=1 -name rhel6 -uuid 075d6f58-cb21-2cbc-796c-60b389457912 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/rhel6.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -drive file=/var/lib/libvirt/images/rhel6.img,if=none,id=drive-virtio-disk0,format=raw,cache=none -device virtio-blk-pci,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=26,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:48:c7:68,bus=pci.0,addr=0x7 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -usb -device usb-tablet,id=input0 -vnc 127.0.0.1:0 -vga cirrus -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6
char device redirected to /dev/pts/1
qemu: terminating on signal 15 from pid 25848
Description: guest can't start nomarly after change the max memmory with the command setmaxmem. Like do this use setmaxmem set the guest's memory 1G --> 4G start normally 4G --> 400MB start normally 400MB --> 4G guest kernel panic How reproduce: 100% Version: libvirt-0.9.8-1.el6.x86_64 qemu-kvm-0.12.1.2-2.209.el6.x86_64 kernel-2.6.32-220.el6.x86_64 --------------------------------------------------------------------------------- Steps: 1. Have a healthy shut down guest. [root@timesu tmp]# virsh dominfo rhel6 Id: - Name: rhel6 UUID: 075d6f58-cb21-2cbc-796c-60b389457912 OS Type: hvm State: shut off CPU(s): 2 Max memory: 1048576 kB Used memory: 1048576 kB Persistent: yes Autostart: disable Managed save: no Security model: selinux Security DOI: 0 [root@timesu ~]# free total used free shared buffers cached Mem: 7949448 1297032 6652416 0 182496 522712 -/+ buffers/cache: 591824 7357624 Swap: 0 0 0 Note:My guest have 1G memory with both Max and Used.It's important for the step next. -------------------------------------------------------------------------------------- 2.Set the guest's Max memory to 4G and make sure it can start normally. [root@timesu tmp]# virsh setmaxmem rhel6 4194300 [root@timesu tmp]# virsh start rhel6 Domain rhel6 started [root@timesu tmp]# virsh dominfo rhel6 Id: 53 Name: rhel6 UUID: 075d6f58-cb21-2cbc-796c-60b389457912 OS Type: hvm State: running CPU(s): 2 CPU time: 12.7s Max memory: 4194300 kB Used memory: 1048576 kB Persistent: yes Autostart: disable Managed save: no Security model: selinux Security DOI: 0 Security label: system_u:system_r:svirt_t:s0:c746,c927 (enforcing) [root@timesu ~]# free total used free shared buffers cached Mem: 7949448 1986112 5963336 0 182496 522388 -/+ buffers/cache: 1281228 6668220 Swap: 0 0 0 [root@timesu tmp]# virsh destroy rhel6 Domain rhel6 destroyed ---------------------------------------------------------------------------------- 3. set the guest's Max memory to 400M and make sure it can start normally. And make sure set 400M not 800M or bigger too. I will explain the reason in Additional info. [root@timesu tmp]# virsh setmaxmem rhel6 419430 [root@timesu tmp]# virsh start rhel6 Domain rhel6 started [root@timesu tmp]# virsh dominfo rhel6 Id: 54 Name: rhel6 UUID: 075d6f58-cb21-2cbc-796c-60b389457912 OS Type: hvm State: running CPU(s): 2 CPU time: 19.7s Max memory: 419430 kB Used memory: 419432 kB Persistent: yes Autostart: disable Managed save: no Security model: selinux Security DOI: 0 Security label: system_u:system_r:svirt_t:s0:c471,c643 (enforcing) [root@timesu ~]# free total used free shared buffers cached Mem: 7949448 1362224 6587224 0 182496 523288 -/+ buffers/cache: 656440 7293008 Swap: 0 0 0 [root@timesu tmp]# virsh destroy rhel6 Domain rhel6 destroyed Note:Here is a question. when the guest fully started , i use dominfo to get the information above. the Used is bigger than the Max.But the guest works fine. ------------------------------------------------------------------------------------ 4.set the guest's Max memory to 4G and I hope it can start normally - -. [root@timesu tmp]# virsh setmaxmem rhel6 4194300 [root@timesu tmp]# virsh start rhel6 Domain rhel6 started [root@timesu tmp]# virsh dominfo rhel6 Id: 55 Name: rhel6 UUID: 075d6f58-cb21-2cbc-796c-60b389457912 OS Type: hvm State: running CPU(s): 2 CPU time: 42.1s Max memory: 4194300 kB Used memory: 465916 kB Persistent: yes Autostart: disable Managed save: no Security model: selinux Security DOI: 0 Security label: system_u:system_r:svirt_t:s0:c279,c620 (enforcing) [root@timesu ~]# free total used free shared buffers cached Mem: 7949448 2034736 5914712 0 182496 522888 -/+ buffers/cache: 1329352 6620096 Swap: 0 0 0 ================================================================================ At this time , the guest was hung.There was NO error log in libvirt.log and the rhel6.log. ================================================================================ [root@timesu tmp]# virsh destroy rhel6 Domain rhel6 destroyed Note:I upload a snapshot of my guest when it hung in attachment. -------------------------------------------------------------------------------------- PS: For restore the guest , you can do this. [root@timesu tmp]# virsh setmaxmem rhel6 1024100 [root@timesu tmp]# virsh start rhel6 Domain rhel6 started [root@timesu tmp]# virsh dominfo rhel6 Id: 56 Name: rhel6 UUID: 075d6f58-cb21-2cbc-796c-60b389457912 OS Type: hvm State: running CPU(s): 2 CPU time: 9.8s Max memory: 1024100 kB Used memory: 419432 kB Persistent: yes Autostart: disable Managed save: no Security model: selinux Security DOI: 0 Security label: system_u:system_r:svirt_t:s0:c626,c822 (enforcing) Now it becomes healthy again.If you want to hung it again , just repeat the step 2-4. -------------------------------------------------------------------------------- Actual result the guest can't start normally. -------------------------------------------------------------------------------- Expect result the guest can start normally. -------------------------------------------------------------------------------- Additional info: For step 3:If set max's memory to 800M , the guest can work well. For reproduce the issue , you need change the max's by a wide margin. I don't know the accurate value, but 400M to 4G is enough to reproduce the problem. -------------------------------------------------------------------------------- Here is the guest's qemu log when it hung: LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin QEMU_AUDIO_DRV=none /usr/libexec/qemu-kvm -S -M rhel6.2.0 -enable-kvm -m 4096 -smp 2,sockets=2,cores=1,threads=1 -name rhel6 -uuid 075d6f58-cb21-2cbc-796c-60b389457912 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/rhel6.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -drive file=/var/lib/libvirt/images/rhel6.img,if=none,id=drive-virtio-disk0,format=raw,cache=none -device virtio-blk-pci,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=26,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:48:c7:68,bus=pci.0,addr=0x7 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -usb -device usb-tablet,id=input0 -vnc 127.0.0.1:0 -vga cirrus -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 char device redirected to /dev/pts/1 qemu: terminating on signal 15 from pid 25848